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I wrote an essay and it contained a lot of it's. Upon doing a grammar check on it, all the it's were suggested to be replaced by its.

I am currently not much familiar with the difference between the two. And when to use which one?

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    its = belonging to it. it's is an abbreviated form of it is. ALWAYS. – FumbleFingers Dec 14 '19 at 16:48
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    @FumbleFingersReinstateMonica Or it has. "It's been fun!" – snailplane Dec 14 '19 at 17:36
  • @snailcar♦: Oops! I now regret and have cancelled my closevote (as "lacking research"). That's two important facts about it's that wouldn't necessarily be easy for a learner to find by casual Internet search - your point, and the one alluded to in my comment under Vsevolod IV's post (about not being able to use the abbreviated form as the final element in an utterance). – FumbleFingers Dec 14 '19 at 18:02
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    I wonder how you could possibly write an essay and not know the difference. – Lambie Jul 16 '20 at 16:53
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A: Whose is that? Is it his?

B: No, its it is

its --> belonging to "it"

it is --> it's (contraction)

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    Native speakers would be very unlikely to come out with that reply (except perhaps "facetiously"). – FumbleFingers Dec 14 '19 at 17:04
  • Wow! Seriously?:p This wasn't meant to be GRAMMATICALLY correct, I only posted it to show how the two work SYNTACTICALLY – Vsevolod IV Dec 14 '19 at 17:07
  • It's "grammatically" fine. But idiomatically it's avoided, which imho makes it a poor example to present to learners (who might not realise they shouldn't copy it). – FumbleFingers Dec 14 '19 at 17:15
  • ...I also believe that grammatically / syntactically it would be perfectly possible (but non-idiomatic) for B to reply No, its is it or No, its it is, and there may even be recorded written instances of either or both. I don't know if it's actually "ungrammatical" to reply No, its it's, but I'm quite sure there won't be any written instances of that version. – FumbleFingers Dec 14 '19 at 17:20
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    Point taken. I'll edit it according to the recommendations given. Thank you!:) – Vsevolod IV Dec 14 '19 at 17:26
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it's - contraction of it is, it has or like as where is or there is

its - possessive form of it and use to say that something belongs to or refers to something like my or your.

For example:
He doesn’t think its a good idea to spend all his money on video games. - incorrect
He doesn’t think it’s a good idea to spend all his money on video games. - correct

Its been a year since the last time they met - incorrect
It’s been a year since the last time they met - correct

The computer looked as though it’s power supply had failed - incorrect
The computer looked as though its power supply had failed - correct

A car is no good without it’s wheels - incorrect
A car is no good without its wheels - correct

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